Add oci gen ai support

[adrianotanaka]

Adding support to OCI Gen AI Services https://www.oracle.com/artificial-intelligence/generative-ai/generative-ai-service/

Just two simple functions:
oci_list_models -> Returns available model per region/compartment
oci_embed -> Return a vector from a string

[CLAassistant]

All committers have signed the CLA.

[smoya]

Hi @adrianotanaka, sorry for the delay on this PR.
We have been in focus mode but we will be reviewing this shortly. 🙏

[adrianotanaka]

Thanks @smoya , please let me know if I can help with anything.

[alejandrodnm]

Hey @adrianotanaka I'm really sorry for the late response. We were on focus mode for the vectorizer work. We are also figuring and add more structure to the way we want to interact with the community, and how to handle, contributions. Expect some new guides, and guidelines coming soon.

Regarding your PR. You should not put SQL code directly in the ai--0.3.0--0.4.0.sql file. You need to add a new file projects/extension/sql/idempotemp/015-oci.sql, add your functions there. This is explained in:

https://github.com/timescale/pgai/blob/main/DEVELOPMENT.md#develop-sql-in-the-pgai-extension

Give it a read, and please if you have any feedback please share.

Since you're importing the oci package, you need to follow the guidelines Develop Python in the pgai extension
, basically you need to add oci as a dependency in the requirementes.txt file:

https://github.com/timescale/pgai/blob/main/projects/extension/requirements.txt

And add #ADD-PYTHON-LIB-DIR as a header in your functions before the import oci, see an example from openAI's embed function:

https://github.com/timescale/pgai/blob/main/projects/extension/sql/idempotent/001-openai.sql#L70

Once you have that, run just ext build-sql and that will generate some sql files like ai--0.4.2-dev.sql, and the upgrades from all the old versions to the new version ai--0.4.1--0.4.2.sql, .... For some reason, might be a bug, or by design, these files are gitignored, you'd need to manually add them to your changes. This files are gitignored, they are not added to the PR to prevent handling merge conflicts on every merge. On release the final extension files will be generated and publish.

Last thing (I think), you need to add some tests for the code, some docs about it:

https://github.com/timescale/pgai/blob/main/projects/extension/sql/idempotent/001-openai.sql#L70

And you can follow the openAI's tests as a guide:

https://github.com/timescale/pgai/blob/main/projects/extension/tests/test_openai.py

Hope this helps, and sorry again for the late response.